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Thick-shell core-shell quantum dots, preparation method thereof and LED

A technology of core-shell quantum dots and quantum dots, which is applied in the field of LED, thick-shell core-shell quantum dots and their preparation, and can solve the problem of restricting the wide application of thick core-shell quantum dots and the difficulty of preparation methods for green light-emitting core-shell quantum dots, etc. problem, to achieve the effect of low cost, controllable wavelength, and narrow half-peak width

Inactive Publication Date: 2017-04-26
TIANJIN ZHONGHUAN QUANTUM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The research group of Professor Peng Xiaogang of Zhejiang University reported the preparation of red luminescent thick-shell CdSe / CdS core-shell quantum dots, but the preparation method is difficult to apply to green luminescent core-shell quantum dots
Therefore, the shortcomings of existing methods largely limit the wide application of thick core-shell QDs.

Method used

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  • Thick-shell core-shell quantum dots, preparation method thereof and LED
  • Thick-shell core-shell quantum dots, preparation method thereof and LED
  • Thick-shell core-shell quantum dots, preparation method thereof and LED

Examples

Experimental program
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Effect test

Embodiment 1

[0054] Due to the use of low-cost cadmium stearate to prepare green luminous CdSe, a rapid cooling process is required, the reaction is not complete, and there is still a large amount of free Cd in the system. 2+ Existence, the general purification process uses n-hexane / methanol extraction, which can only remove a large amount of ligands and some unreacted precursors, but cannot remove the ions adsorbed on the surface of the quantum dot core.

[0055] In this example, TBP is used to activate the surface of the fully reacted CdSe quantum dot core to remove free Cd on the surface. 2 + , and then use the CdSe quantum dots purified by TBP as the core, inject the shell matrix to grow the shell, and the process is as follows figure 1 As shown, 1 is the surface adsorbed Cd 2+ CdSe quantum dot core, 2 is the purified CdSe quantum dot core, 3 is the quantum dot covered with buffer layer, 4 is the thick shell core-shell quantum dot.

[0056] At the same time, compared with the prepar...

Embodiment 2

[0088] Extraction and purification steps: Dissolve the prepared 5nmol quantum dot nuclei in 10mL of n-hexane and 6mL of methanol, then add 100μL of triphenylphosphine reagent, purify 4 times at 40°C, each time for 5min, and obtain quantum dot nuclei without ion adsorption on the surface .

[0089] The preparation of the core-shell quantum dot matrix solution, the preparation of the CdSe core, and the preparation of the CdSe / ZnS core-shell quantum dots can refer to Example 1.

Embodiment 3

[0091] Extraction and purification steps: Dissolve the prepared 5nmol quantum dot nucleus in 30mL of n-hexane and 20mL of methanol, then add 500μL of tri-n-octyl phosphorus reagent, and purify twice at 70°C for 15min each time to obtain quantum dots with no ion adsorption on the surface nuclear.

[0092] The preparation of the core-shell quantum dot matrix solution, the preparation of the CdSe core, and the preparation of the CdSe / ZnS core-shell quantum dots can refer to Example 1.

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Abstract

The invention relates to preparation of quantum dots, and discloses a preparation method of thick-shell core-shell quantum dots. A key step is that after quantum dot cores are prepared, an organic phosphine reagent is used for removing metal ions adsorbed on surfaces of the quantum dot cores, wherein the organic phosphine reagent is at least one of tributyl phosphine, triphenyl phosphine, tri-n-octyl phosphine, diphenyl phosphine, and dioctyl phosphine. The invention also discloses an LED containing the quantum dots. The invention provides a simple, convenient and economical method for preparing efficient green light-emitting core-shell quantum dots, and the method, based on an organic phosphine reagent assisted quantum dot extraction purification process, can be used for preparing thick-shell core-shell quantum dots which are controllable in wavelength, narrow in half band width, and high in quantum yield.

Description

technical field [0001] The invention relates to the preparation of quantum dots, in particular to a thick-shell core-shell quantum dot, a preparation method thereof, and an LED containing the quantum dot. Background technique [0002] Semiconductor quantum dots are widely used due to their size-dependent optical properties and excellent chemical stability. However, the single quantum dot core has poor stability and certain biological toxicity, which limits its further application. Wrapping a thick shell on the surface of the quantum dot core can effectively prevent the leakage of heavy metal ions and improve the stability of the quantum dot. [0003] In recent years, thick-shell core-shell quantum dots have been widely used in LED displays, solar energy, and biological applications due to their high stability and large Stokes-shift; especially red, green, and blue , three primary colors, widely used in QLED backlight, display and so on. However, the reported thick-shell c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/88H01L33/04
CPCC09K11/02C09K11/883H01L33/04
Inventor 王恺郝俊杰陈威卢睿杨磊孙小卫边盾
Owner TIANJIN ZHONGHUAN QUANTUM TECH CO LTD
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